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arm64: remove DMA_ERROR_CODE 

The dma alloc interface returns an error by return NULL, and the
mapping interfaces rely on the mapping_error method, which the dummy
ops already implement correctly.

Thus remove the DMA_ERROR_CODE define.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
This commit is contained in:
Christoph Hellwig 2017-05-21 12:21:50 +02:00
parent 50f5c08b01
commit e0d60ac10e
2 changed files with 1 additions and 3 deletions
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1
arch/arm64/include/asm/dma-mapping.h
View File

@ -24,7 +24,6 @@
#include <xen/xen.h>
#include <asm/xen/hypervisor.h>
#define DMA_ERROR_CODE (~(dma_addr_t)0)
extern const struct dma_map_ops dummy_dma_ops;
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)

3
arch/arm64/mm/dma-mapping.c
View File

@ -184,7 +184,6 @@ static void *__dma_alloc(struct device *dev, size_t size,
no_map:
__dma_free_coherent(dev, size, ptr, *dma_handle, attrs);
no_mem:
*dma_handle = DMA_ERROR_CODE;
return NULL;
}
@ -487,7 +486,7 @@ static dma_addr_t __dummy_map_page(struct device *dev, struct page *page,
enum dma_data_direction dir,
unsigned long attrs)
{
return DMA_ERROR_CODE;
return 0;
}
static void __dummy_unmap_page(struct device *dev, dma_addr_t dev_addr,